During the German occupation of Norway he was a member of the Norwegian resistance movement. He was arrested in January 1944, and spent time at the concentration camps Grini, Natzweiler, Dachau, Ottobrunn, Dautmergen and Vaihingen. In April 1945 sixteen Norwegians were liberated by the White Buses from Vaihingen, among them Grindrud and later Prime Minister Trygve Bratteli.
- Ottosen, Kristian (2 July 2001). "Gjensyn med Vaihingen". Aftenposten (in Norwegian). Retrieved 2008-05-06.
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